Add lnd config to sideload headers.

[Chinwendu20]

Change Description

This pull request adds a new neutrino config to preload headers from non-p2p source when using the neutrino backend.
It depends on this:
lightninglabs/neutrino#285.

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[Chinwendu20]

I set up this test so that it does not connect to the miner so that I can be sure that blockheaders are fed through the sideload source. The problem with that is that cfheaders would not be updated and lnd waits for the chain to be synced before starting up fully so this test would not work.

I do not know if there are any suggestions around this.

Or maybe I would continue with this when I include cfheaders sideloading in the neutrino side (which I would do after I get feedback and clarification on the latest iteration)

CC: @Roasbeef

[Roasbeef]

Or maybe I would continue with this when I include cfheaders sideloading in the neutrino side (which I would do after I get feedback and clarification on the latest iteration)

Yeah we want both the regular block headers and cfheaders.